Results 31 to 40 of about 2,970,923 (298)
Solar Cycle Dependence of Solar p Modes [PDF]
Symposium - International Astronomical Union, 1988 Data obtained at Izana (Tenerife) and Haleakala (Maui), using optical resonant scattering with a potassium vapour cell over the years 1980–84, are used to determine the frequencies of the low ℓ p modes. Possible variation in these frequencies with the solar cycle are investigated.
G.R. Isaak +7 more
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International Journal of Geophysics, 2012 We analyse the variability of foF2 at two West Africa equatorial ionization anomaly stations (Ouagadougou and Dakar) during three solar cycles (from cycle 20 to cycle 22), that is, from 1966 to 1998 for Ouagadougou and from 1971 to 1997 for Dakar.
Frédéric Ouattara +2 more
doaj +1 more source
Prediction of even and odd sunspot cycles
Journal of Space Weather and Space Climate, 2023 Here we study the prediction of even and odd numbered sunspot cycles separately, thereby taking into account the Hale cyclicity of solar magnetism. We first show that the temporal evolution and shape of all sunspot cycles are extremely well-described by ...
Asikainen Timo, Mantere Jani
doaj +1 more source
Earth, Planets and Space, 2019 In order to statistically investigate the relationship between the low-latitude coronal holes (CHs), the solar wind speed, and the geomagnetic activity in solar cycles 23 (1996–2008) and 24 (2009–2016), we conducted a superposed epoch analysis of the ...
Yumi Nakagawa +2 more
doaj +1 more source
Solar cycle dependence of scaling in solar wind fluctuations [PDF]
, 2008 In this review we collate recent results for the statistical scaling properties of fluctuations in the solar wind with a view to synthesizing two descriptions: that of evolving MHD turbulence and that of a scaling signature of coronal origin that ...
B. Hnat +6 more
core +2 more sources
Solar Cycle 25 Prediction Using N-BEATS
The Astrophysical Journal, 2023 Solar activities lead to Sun variation with an 11 yr periodicity. The periodic variation affects space weather and heliophysics research. So it is important to accurately predict solar cycle variations. In this paper, we predicted the ongoing Solar Cycle
Xu Su +4 more
doaj +1 more source
The New Composite Solar Flare Index from Solar Cycle 17 to Cycle 24 (1937 – 2020)
, 2022 The chromosphere is a highly dynamic outer plasma layer of the Sun. Its physical processes accounting for the variability are poorly understood. We reconstructed the solar chromospheric flare index (SFI) to study the solar chromospheric variability from ...
Acosta Jara, Jose Nemesio +12 more
core +1 more source
Energies, 2022 This paper investigates and compares several highly efficient thermodynamic cycles that are suitable for coupling with particle-in-tube fluidized-bed solar receiver technology.
Miguel Angel Reyes-Belmonte +1 more
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Understanding Solar Cycle Variability [PDF]
The Astrophysical Journal, 2017 Abstract The level of solar magnetic activity, as exemplified by the number of sunspots and by energetic events in the corona, varies on a wide range of timescales. Most prominent is the 11-year solar cycle, which is significantly modulated on longer timescales.
R. H. Cameron, M. Schüssler
openaire +3 more sources
Variation of Solar, Interplanetary and Geomagnetic Parameters during Solar Cycles 21-24 [PDF]
Journal of Astronomy and Space Sciences, 2013 The length of solar cycle 23 has been prolonged up to about 13 years. Many studies have speculated that the solar cycle 23/24 minimum will indicate the onset of a grand minimum of solar activity, such as the Maunder Minimum.
Suyeon Oh, Bogyeong Kim
doaj +1 more source